皮皮学，免费搜题
登录
搜题
【简答题】
已知f(x)是定义在(-∞，+∞)上的不恒为零的函数，且对定义域内的任意x，y，f(x)都满足f(x·y)=y·f(x)+x·f(y)， (1)求f(1)，f(-1)的值； (2)判断f(x)的奇偶性，并说明理由．
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】— Is this your sister Joan? — _____. She is my friend Susan. [ ]
A.
Yes, she is
B.
Yes, it is
C.
No, she isn't
D.
No, it isn't
【单选题】—Don’t forget to come to my birthday party tomorrow ． — .
A.
． Idon ’ t
B.
． 1won’t
C.
． Ican’t
D.
． I haven’t
【单选题】Is it polite to ask your friend this question “What is your salary”?
A.
Yes, it is.
B.
No, it isn’t.
【简答题】将下列句子改写为复数形式。 1. What is this? 2. That apple is red. 3. It is my book. 4. This is my friend. 5. - Is this your pen? - No, it isn ’ t. 6. That is a cute dog, it is white. 7. Open that door, please.
相关题目：